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Low zinc environment induces stress signaling, senescence and mixed cell death modalities in colon cancer cells

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Abstract

Currently it is not clear what type of the final cellular response (i.e. cell death modality or senescence) is induced upon chronic intracellular zinc depletion in colon cancer cells. To address this question, isogenic colon cancer lines SW480 and SW620 exposed to low zinc environment were studied over the period of 6 weeks. Low zinc environment reduced total as well as free intracellular zinc content in both cell lines. Decreased intracellular zinc content resulted in changes in cellular proliferation, cell cycle distribution and activation of stress signaling. In addition, colonocytes with low zinc content displayed increased levels of oxidative stress, changes in mitochondrial activity but in the absence of significant DNA damage. Towards the end of treatment (4th–6th week), exposed cells started to change morphologically, and typical markers of senescence as well as cell death appeared. Of two examined colon cancer cell lines, SW480 cells proved to activate predominantly senescent phenotype, with frequent form of demise being necrosis and mixed cell death modality but not apoptosis. Conversely, SW620 cells activated mostly cell death, with relatively equal distribution of apoptosis and mixed types, while senescent phenotypes and necrosis were present only in a small fraction of cell populations. Addition of zinc at the beginning of 4th week of treatment significantly suppressed cell death phenotypes in both cell lines but had no significant effect on senescence. In conclusion, presented results demonstrate variability of responses to chronic zinc depletion in colon cancer as modeled in vitro.

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Acknowledgments

This work was supported by the program PRVOUK P37/01.

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  1. Department of Medical Biology and Genetics, Faculty of Medicine in Hradec Kralove, Charles University in Prague, Šimkova 870, 500 38, Hradec Kralove, Czech Republic

    Emil Rudolf & Kamil Rudolf

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  1. Emil Rudolf
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Correspondence to Emil Rudolf.

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Rudolf, E., Rudolf, K. Low zinc environment induces stress signaling, senescence and mixed cell death modalities in colon cancer cells. Apoptosis 20, 1651–1665 (2015). https://doi.org/10.1007/s10495-015-1182-5

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